Drier



G. B. DAMON DRIER bem-Sheet l Oct. 4, l92l Fil MMM

ATTORNEYS Dec. 4'

G. B. DAMON DRIER Filed Oct. 4, 1921 5 sheets sheet 5 INVENTOR GEORGE FIM/wo l 55. JAMON DRIER Filed Oct. 4, 1921 A A A. E

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l INVENTOR GEORGE B. EHM f ATORNEYS G. B. DAMON' DRIER Filed Oct. 4, 1921 5 Sheets-Sheet 5 INVENTOR GEORGE E .ZM/wo I ATORNEYS Patented Dec. 9, 1924.

UNITED STATES PATENT OFFI E.

GORG-E B. DAMON, OF BELVIDERE, NEW J'EBSEY, ASSIGNOR TO VULCAN IRON WORKS,

0F WILKES-BARRE, PENNSYLVANIA,

A CORPOBATION OF PENNSYLV'ANIA.

D IER.

Application filed October 4, 1921. Seria] No. 505,434.

To all whom it may concern: 4

Be it known that I, GEORGE B. DAMON, a citizen of the United States of America, residing at Belvidere, in the County of Warren and State of New Jersey, have invented certain new and useful Improvements in Driers, of which the following is a specification.

My invention'relates to driers, and particularly to rotary driers of the double Shell type shown in my Copending application Serial No. 397,055, filed July 17, 1920, now Patent No. 1,447 ,929, dated March 26, 1923, of Which the present application is in part a continuation. As pointed out in said application, the inner flue of the drier may be conical, with its small end arranged either toward the stack or toward the fire box. In the present application, so far as the invention relates to the shape of the flue, the latter is of the type in which the small end of the flue is arranged toward the stack, and is specific to this type as distinguished from the opposite arrangement shown in detail in the application above referred to.

I have also indicated various features of novel ty in the present construction which have no dependence upon the particular shape of the flue or its arrangement, and as to these features so far as they present invention over the subject-matter of my` co- -pending application, the present constitutes a continuation thereof.

' The features of improvement Which I regard as my invention Will be hereinafter pointed out in the specification and Claims, or may be observed from the illustrative em bodiment thereof .in the accompanying drawings, in Which- Fig. 1 is alongitudinal side elevation of a drier installation in which my invention is embodied;

F ig. 2 is a plan thereof; l

Fig. 3 is a broken side' elevation drawn to an enlarged Scale of the feed end of the drier;

Fig. 4 is an end elevation thereof;

Fig. 4 is a Vertical Section through the fan shown in F igs 3 and 4, the blades being in the position 'assumed when the fan is at rest.

Fig. 5 is a broken side elevation of the .fire box endof the drier drawnto an enlarged Scale;

Fig. 6 is a partial plan view of the feed hopper and reciprocating feeder;

Fig. 7 is a longitudinal section there- 'through showing the feeder at the end of its return stroke;

Fig. 7* is a section On the line 7 Fig. 7; Fig. 8 is a broken transverse Section through the tempering Chamber portion of the fire box end of the structure; and

Fig. 9 is a section through the drier cylinder.

'Chamber 12 thereof, on the one hand, and the stack 13 -on the other hand. The Shell' carries the usual circumferential gear ring 14 which meshes with a pinion 15 driven through a suitable gear train from the pul-` ley shaft 16, which is in turn driven by the belt 17 from the electric motor 18. Bearing rings 19 and 20 suitably spaced apart upon the cylinder, run on suitable roller pairs 21 and 22 mounted on pedestals 23 and 24. The proper mesh of the gears 14 and 15 as well as a proper location of the delivery end of the cylinder with relation to the fire box may be obtained by a suitable regulation of the bearing blocks 25 and 26 (F ig. 9) which are transversely adjustable on their bases 27 by means of adjusting screws 28 and 29.

Within the cylinder 10 and substantially concentric therewith is a conical flue 30 supported within the Shell 10 by any suitable means, such as rigid struts 31 shown in Fig. 9, or by flexible links of the type indicated in my Copending application. Projecting into the annular space 32 between the fiue and Shell, are flights 33 whichserve to repeatedly cascade the material as it passes gradually through the annular drying Chamber 32 from the stack end thereof tothe fire box end thereof, as a result of the tween the flue 30 and the shelllO at. the

stack end thereof, is sufficiently great, as' a result of the conical Shape of the flue, .to permit the use of a mechanical feeder for introducing the wet material to the annular (lrying space 32. vA suitable feeder is illustrated in Figs. 3 and 4,`and on a larger Scale in Figs. 6 and 7. As Wll be noted from Fig. 3, the stack 13 rises from a Wind box 34, through a hole 35 in the side of which open the cylinder `shell 10 and flue 30. Projecting through the opposite side of the Wind box is a feed trough 36, to Which material maybe delivered through the hopper 37. Reciprocating in the trough .36 is a feeder comprising longitudinally extending sha-fts 38 having clamped thereon, at su table adjustable intervals, a series of collars 39. Integral therewith are rigid stops 40 While pivoted thereon are push plates 41 Which rest against the stops 40 on the feed stroke, but swing away from the same above `the material in the trough on the return stroke, as illustrated in Fig. 7`.' A connectin rod 42 extends between the outer end of the shaft 38 and the crank 43 on the pulley shaft 44, Whch is driven by a belt 45, lay shaft pulley 46 and belt 47 from the electric motor 48. The shafts 38 carry crosS spindles 49, With supporting rollers 50 upon Which the feeder runs on the sides of the trough. Guides 51 mounted on opposite sides of the trough overlie the rollers 50 and restrain the feeder against displacemen't.

Above the Wind box 34,'and between the latter and' the stack 13 is a fan Chamber 52. The fan 53 arranged within this Chamber forms the subject matter of a separate application filed by me October 4, 1921, Serial' No. 505,435 and as therein set forth more fully, comprises unbalanced pivoted blades 53 Which When the fan is at rest, assume 'a substantially perpendicular position and thus offer the least possible obstruction of the draft passage to the stack. It may be noted, however-,that the fan is supported upon a Vertical shaft 54 passing through the Wind box 34 and having a step bearing 55 on the pedestal 56. On thefan shaft is a pulley' 57 around Which passes the belt 58 from the' pulley 59 on the lay shaft 46.

A lateral opening 60 -afl'ords access to the interior of the Wind box 34, but is normally closed by a sliding door 61 in order' to pre- Vnt leakage into the Wind' box.

In order to keep the fan blades clean and free from accumulation of dust or Soot, Which might prevent their proper functioning, I provide the fan Chamber 52 With .a lateral opening, Wh ch is normally closed by a door 52% through Which access to the interior 'of the fan Chamber may be obtained by' the attendant for brushing the blades clean.

damper late 62 pivoted at 63 to the suppolting ever arm 64. The latter is mounted in such osltion at 65 onthe outer W all of the win box that the damper 62 may be' ,swung down to more or less close the discharge end of the flue '30 as may be necessary to maintain the desired draft through the fiue. To operate the lever 64 I provide Also'mounted Within the Wind box is a a link 66 connected to the lever at one end ing Chamber 32 is repeatedly cascaded there-.

in by the flights 33 as thecylinder rotates. It eventually approaches the discharge end (Fig. 5) and falls in dried condition to the transversely arranged receiving trough 72.

A reciprocating scraper 73 of the same type as that used at the feed end of the drier may be employed to remove the dried material laterallyto a pit 74. A bucket pit and discharges it at any desired point. The scraper 73 and hoist 75 may beconveniently driven by an electric motor 76 through ablt shaft 77. Beveled gears 78 drive the crank shaft 79 forthe scraper,

while the chain 80 drive s the sprocket for the chain hoist 75.

The fire box 11 is here indicated as ac-` s commodating a chain grate Withx'a forcd chain 'hoist 75 lifts the material from the draft through the fire bed 82 from the tuyre box .83, to which the blast is 'admitted through conduits 84 (Fig. 2 from the fan 85. Theproducts of com ustion passing around the' 'furnace arch 86 enter the tempering Chamber 87, to Which 'excess air, that is to say air in excess of that required to support combustion, is admitted through ports 88 controlled by valve shutters 89. The temperature of the gases may be loWered to a suitable extent by a greater or less opening' of'the shutters 89. The' gases thustempered pass throu h 'a checker- Work '90 into a second tempering' Chamber 91, to Which open further ports 92 controlled.`

by similar Shutter valves 93.

A third tempering Chamber 94 is/separated from the Chamber 91 by the checker-work 95, and is-similarly' provided With Shutter valves 96 controlling the admission of fury ther excess air: The checker-Work partitions 90 and- 95 between the tempering chambers serve not only toeifect a proper commlngling of the excess air with the products of Gombustion, but -to stabilize the temperature of the gases passing through the drier regardless of Variations in the intensity of the fire. The flue 30 is extended beyond the Shell a't the fire box end of the drier and opens into the tempering 'Chamber 91.'

The gases passing into the flue are therefore at a higher temperature than those which' undertreatment that the latter are not sub jected to injurious heat.

In order to protect the checker work 95 against possible mechanical injury during the rotation of the drier, I mount a collar 97 at the opening therein Which receives the flue 30. A similar bearing collar 98 may be arranged in the end Wall of the furna'ce in which the Shell 10 is received.

To drive blower fan 85, I referably employ an electric motor 99 with a belt connection 100 to the fan Shaft. The same mot0r may be employed to drive the chain grate 81`tl1rough suitable transmission devices to the worm shaft 101.

Inasmuch as the fan 85 delivers a forced (lraft to the grate, the products of combustion in the fire box are slightly above atmospheric pressure, and the operation of the stack fan 53 may be necessary, under certain atmospheric conditions, to supplement the pull of the stack draft in order to draw through the flue and drying Chamber, not

only the products of combustion but also the excess air admitted to the tempering chambers. The fan is preferably so operated as to efl'ect a condition of balanced draft, that is to say, to insul'e a discharge through the stack at a' rate sufficient to carry off the products of combustion properly tempered by excess air, together with the moisture absorbed from the material by the gases as they pass through the drier.

Where material is under treatment which is loath to part with its moisture, the arrangement of the conical flue, with its Small end directed towa-rd the stack, has the advantage of delaying the' passage ofthe material through the drier, since the flights on the flue instead of dropping the material further down the Shell toward thedischarge end thereof, drop it more nearly perpendicularly than is the case where the flue is cylindrical, like the Shell, or has its smaller end directed toward the discharge end of the i drier, as in my copending application..

While the latter construction accelerates the passage of material through the drier, and is for that reason desirable where the materlal readily parts with itsmoisture, the present drler is of particular value when dealing With material such as coal, loam, clay, some iron ores, liminite, Which give up their moisture slowly.

It mayv be further pointed out that the. gases' passing through the flue contract as they Cool, and the construction accomodates this condition.

WVhile the construction shown is suitable for carrying out the objects of my invention, it will be readily recognized that Various modifications of construction and arrange- Sirable in view of the fact that the last few' per 'cent of moisture in the material require the most time and heat for their extraction.

Second, the velocity of the gases through 'the annular drying Chamber is retarded toward their discharge end, thus affordin them a chance to deposit their entrain dust on the incoming wet materiah Third, ample space is afforded for the introduction of the ,wet material by some positive feeder device at the stack end of the drier. Fourth, proper regulation of the gases may be obtained by the tempering Chamber. Fifth, the Wind bo'X or eXpansiOn or settling cham= ber at the stack end of the drier afl`ords a suitable arrangement for the elimination of the fines or dust carried out by the gases. Sixth, the fan makes possible a 'condition of balanced draft through the apparatus, when using gases under pressure fro-In the fire Chamber. In other words, the stack fan provides a suction through the drier suflicient to take off the products of combustion under slight pressure in the combustion Chamber, together with the tempering aIr, while at the same time removing these gases at thevlowest possible' speed commensurate with desired draft conditions in order that the dust particles may have opportunity to settle on the incoming wet material instead of being drawn off at high velocity through the stack. Seventh, the general arrangement` of parts and specific construction of integers are of a rugged, substantialcharacter well adapted for the services whlch they are called upon to perform.

What I claim as my invention is- 1. A drier conprising a rotary Shell and inner 'flue, afording between them an annular drying Chamber of gradually increasing Cross section-al area from the gas intake to the gas outlet ends of the drier.

, 2. A drier 'comprising a rota-ry Shell and ing Cross sectional area from the-gas intake to the gas outlet ends of the drier, together' with means `for feecling material to the aninner flue, afl'ording between them anannular drying Chamber of gradually increasto the gas outlet ends of the drier, together with means for feeding material to the annplar Chamber at the gas outlet end thereo 3. A clrier comprising a rotary Shell and inner fiue, afl'ording between them an annular drying Chamber of gradually increasing crossseCt-ional area from the gas intake nular chamberat the' gas outletend thereof, a receptacle, to which dried material is dlschargecl, and means. therein for remov- (ing the material from Said reoeptacle 4. A drier comprising a rotary hell and inner flue, afiording between them an annular drying Chamber of gradually increasing cross sectional area from One end to the other, and having its bottom inclinedin one direction, gasinlets and outlets at opposite ends of .the drier, means for feeding material to the annular Chamber-at the gas outlet end -thereof, a trough for receiving dried material discharged at the gas inlet end of l said chamber and areciprocating member for removing said material from the receiving trough.

5. A drier comprising a rotary Shell and inner flue, afi'ording between them an annular drying Chamber of gradually increasing CI'OSS Sectional' area from one end to the other, and having its bottom inclined in one direction, gas inlets and outlets at opposite ends of the drier, means for feeding material to the annular Chamber at the gas discharge end thereof, means for receiving said material discharged at the gas inlet end of the Chamber, and means for removing Said material laterally from Said trough, to-

gether with a conveyor to which the removed material is discharged.

6. A drier comprising a rotary Shell and inner flue aflording between them an annular drying Chamber, a source of heating gases opening to the corresponding ends of said flue and annular drying Chamber, in.

combination with a fan at the air discharge end 'of the drier for accelerating the passage of the gases through the latter.

` plyin inner flue, affording between them an annular drying Chamber, and means for supat the corresponding ends thereof heat gases under pressure andat different temperatures for said flue and drying chamber, together with a fan at the discharge end of the drier for accelerating the passage of the gases through the latter.

9. A drier comprising a rotary Shell and inner flue, affording between them an annular drying chamber..mea ns for supplying heated gases to said flue and annular drying Chamber, a settling Chamber at the opposite end of the drier to which the gases are discharged, and a' `fan for accelerating Chamber.

10. A drier comprising a rotary Shell and inner flue. affording between them an annular drying Chamber, a fire Chamber for generating heated gases for the drier,

checker-work through which said gases pass before enteringthe drier, an opening in said checker-work forthe reception of the flue, and a'wearing ring lining said opening to protect the same against mechanicalinjuly during the operation of the drier;

11. A-drier comprising a rotary Shell and A inner flue, aflording between them an annular drying Chamber, a -fire Chamber at one end of the drier, means for supplying forced draft to the fire Chamber, means for leading theproducts -of combustion under pressure through the intake' ends of the flue and annular drying Chamber at one end of the drier; and a fan at the other end of thedrier for accelerating the flow of the heated gases through-the drier.

12. A drier comprising a rotary Shell and inner flue, afording between them an annular drying Chamber, a fire Chamber at one end of the drier, means for supplying forced draft to the fire Chamber, means for leading the products of combustion under pressure through the intake ends of the flue and annulal` drying Chamber at one end of thedrier, a fan at the other end of the drier for accelerating the fiow'of the products of combustion through the fue and; drying chamber, together with means for admitting excess air to'the products of combustion between the fire box and the intake of the drier.

13.' In a rotary drier, an outer Shell and inner flue, aflordingbetween them an annular'drying Chamber, means for supplying heated gases under pressure and excess air to the flue and drying-Chamber at one end of the drier, in combination with a fan at the other end of the drier for inducing the flow of gases and excess air through the flue and drying Chamber.

the passage of the gases through the settling 14. A drier comprising a rotary Shell and inner flue, aflording between them` an annular drying Chamber of gradually increasing cross Sectional area from the discharge to the intake ends thereof, means -for passing heated gases in the same direction through Said flue and. annular drying chamber from the discharge end of the latter, to-

' ing hamber, a settling Chamber to which said gases are discharged, a stack communi cating with the settling Chamber, and means for passing material through said settling Chamber to the annular drying Chamber.

. 16. 'A drier eomprising a rotary Shell and inner flue, affording between them ran annular Chamber, means for passing heated gases through the flue and annular drying chamber, a settling Chamber to which gases are discharged, a damper pivoted in said settling Chamber, and means operable from the exterior thereof for closing to a greater or less extent the gas escape end of the flue.

17. A drier comprising a rotary Shell and inner flue, afiording between them an annular dryingchainber, means for passing heated gases through the flue and annular drying Chamber, a settling Chamber to which said gases escape from the drier, a fan associated with the settling Chamber for accelerating the removal of the discharged gases from said chamber,-and means exterior to the latter for driving the fan.

18. A drier comprising a rotary Shell and inner flue, afl'ording between them an annular drying Chamber, means for passing heated gases through the flue and annular dryin sal d gases escape from the drier, a reciprocating feeder passing through the settling Chamber `forintroducing material to the annular drying Chamber, and a fan for accelerating the removal of A the .discharge ases from the settling Chamber.

19. In a drier, a rotary Shell and inner flue, afiording between them an annular drying Chamber, a settling Chamber' to which escape the gases passing through said flue and Chamber, a feed trough passing through said settling Chamber for leading Chamber, a 'settling Chamber to which Qombination With a reciprocating feeder Working in said trough and comprlsing piv oted pallets having a one-Way operative engagement With the material in the trou h.

20. A rotary drier having at one en a Settling Chamber and a stack, a rotary stack fan, a driving spindle therefor rising through the settling Chamber, and means terior to the' latter for driving the spine. t 21. A rotary drier having at one end a settling Chamber and a stack, a rotary stack 'an, a fan Chamber interposed between the settling Chamber and the stack, a spindle rising through the settling Chamber to the 'an Chamber, and means exterior to said chambers for driving the spindle.

22. A rotary drier having at one end a settling Chamber and a stack, a fan Chamber interposed between the settling- Chamber and the stack, a rotary stack fan arranged on a Vertical a Xis in said fan Chamber, said fan Chamber having a lateral opening to permit access to the fan arranged therein, a door normally closing said opening, a fan spindle rising through the Settling Chamber to the fan Chamber, and means exterior to said Chamber for driving the spindle.

23. A rotary drier having at one end a Settling Chamber and a stack, a rotary stack fan arranged above the settling Chamber, and having blades mounted to automatically move to non-obstructing` position when the fan is at rest, and means to drive the fan.

24. A rotary drier having at one end a settling Chamber and a stack, a rotary stack fan, a Vertical fan spindle extending below the stack,` a fan on said spindle, a top bearing for the spindle within the stack, a step bearing for the lower end of the spindle exterior to the stack, and means fordriving the exposed lower end of the spindle to rotate the fan.

In testimony whereof Ihave signed my name to this-specification. v

GEORGE B. DAMON. 

